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【单选题】
根据《建筑施工起重吊装安全技术规范》（2012实施）钢柱吊装过程中下列说法错误的是（）A.
就位时必须待临时固定就位后方可脱钩
B.
吊装应垂直，吊点宜选择柱顶部
C.
起吊时，钢柱根部允许着地拖拉
D.
安装前，钢柱上将登高扶梯和操作挂篮或平台临时固定好
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